A subset of Mel202/DR1/CD80 vaccine-activated CD4+ T cells expressed this regulatory phenotype (CD4+/CD25+/CD127-/FoxP3+) (Figure 6A) and upregulated FoxP3 gene expression (Figure 6B), indicating that although a regulatory component of the vaccine-activated CD4+ T cell response was induced, the anti-tumor response marked by IFNγ-release and CD4+ T cell proliferation was not limited by these regulatory CD4+ T cells. Here, CD80 is linked to neoplasm.